Automatic division system source code of slope unit based on confluence analysis and slope direction Division

Automatic division system source code of slope unit based on confluence analysis and slope direction Division


1) The work of automatically dividing a wide and complex geospatial area or even a complete watershed into repeatable and geomorphically consistent topographic units is still in the stage of theoretical concept, and there are great challenges in practical operation. Terrain unit is a further subdivision of topography and geomorphology, which can ensure the maximum uniformity of geomorphic features in slope unit and the maximum heterogeneity between different units. It is suitable for geomorphic or hydrological modeling, landslide detection in remote sensing images, landslide sensitivity analysis and geological disaster risk assessment. 2) Slope unit is an important type of topographic unit. Slope unit is defined as the area surrounded by watershed and catchment line. In fact, the area surrounded by watershed and catchment line is often multiple slopes or even a small watershed. Theoretically, each slope unit needs to ensure the maximum internal homogeneity and the maximum heterogeneity between different units. The slope unit is an area with obviously different topographic characteristics from the adjacent area. These topographic characteristics can be based on the characteristics of catchment or drainage boundary, slope and slope direction, such as ridge line, valley line, platform boundary, valley bottom boundary and other geomorphic boundaries. According to the high-precision digital elevation model, the slope unit with appropriate scale and quality can be drawn manually, but the manual drawing method is time-consuming and error prone. The quality of the divided slope unit depends on the subjective experience of experts, which is suitable for small-scale areas and has no wide and universal application value. Aiming at the gap in practical operation in this field, we propose an innovative modeling software system to realize the optimal division of slope units. Automatic division system of slope unit based on confluence analysis and slope direction division v1 0, written in Python programming language, runs and calculates as the grass GIS interpolation module, and realizes the automatic division of slope units in a given digital elevation data and a set of predefined parameters. 4) Based on python programming language, the code is flexible and changeable, which is suitable for scientific personnel with different professional knowledge to make a wide range of customization and personalized customization. In addition, the software can provide high-quality slope unit division results, reflect the main geomorphic characteristics of the region, and provide a based evaluation unit for fine landslide disaster evaluation and prediction. It can serve regional land use planning, disaster risk assessment and management, disaster emergency response under extreme induced events (earthquake or rainfall, etc.), and has great practical guiding significance for the selection of landslide monitoring equipment and the reasonable and effective layout and operation of early warning network. It can be popularized and applied in areas with serious landslide development.


File naming and required software

File naming: the source code is written in Python programming language. Its program operation and result export depend on the grass GIS software platform. In essence, it is an embedded plug-in of the grass GIS software.
Data reading mode: the software needs to run under GNU / Linux system, and the sequence operation and result export depend on the grade GIS software. GRASS GIS (Geographic Resources Analysis Support System) is a free and open source geographic information system (GIS), which can be used to process raster, topological vector, image and chart data( https://packages.debian.org/search?keywords=grass )


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Cite as:

Yang, Z. (2022). Automatic division system source code of slope unit based on confluence analysis and slope direction Division. A Big Earth Data Platform for Three Poles, DOI: 10.11888/Terre.tpdc.272183. CSTR: 18406.11.Terre.tpdc.272183. (Download the reference: RIS | Bibtex )

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Support Program

Catastrophic mechanisms and risk control of disastrous landslides in the Tibetan Plateau (No:2018YFC1505000)

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License: This work is licensed under an Attribution 4.0 International (CC BY 4.0)


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  • Temporal coverage: 2022
  • Updated time: 2022-03-25
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: YANG Zhongkang  

Distributor: A Big Earth Data Platform for Three Poles

Email: poles@itpcas.ac.cn

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